build(deps): bump bottle from 0.12.15 to 0.12.19

Bumps [bottle](https://github.com/bottlepy/bottle) from 0.12.15 to 0.12.19.
- [Release notes](https://github.com/bottlepy/bottle/releases)
- [Changelog](https://github.com/bottlepy/bottle/blob/master/docs/changelog.rst)
- [Commits](https://github.com/bottlepy/bottle/compare/0.12.15...0.12.19)

---
updated-dependencies:
- dependency-name: bottle
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -1,6 +1,6 @@
 # These are the versions we *know* work under Python 2.7.16
 argparse==1.2.1
-bottle==0.12.15
+bottle==0.12.19
 enum34==1.1.6
 gevent==1.3.7
 jsonschema==2.6.0

setup.py

@@ -54,7 +54,7 @@ setup(
     # work, for instance.
     install_requires=[
         "argparse",
-        "bottle==0.12.15",
+        "bottle==0.12.19",
         "enum34==1.1.6",
         "gevent==1.3.7",
         "jsonschema==2.6.0",